I was trying to open forms from IE-8 and i was getting the following error. Here are the steps to resolve this problem.
If you are trying to connect to Apps 11i/R12 instance from IE 8 and getting error “FRM-92050 failed to connect to Server /forms/servlet -1“ while opening forms.
Check the version of IE. If version of IE is 8 then disable XSS filter
Go to Tools> Internet Options> Security> then click on the custom level.
Scroll down to the end of the screen and disable the XSS filter. Click on the ok button.
Now you can launch the forms.